$1,346 Cheap Flights from Washington (IAD) to Mount Isa (ISA)

View $1,346 flight on Tue, Nov 11, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Mount Isa, QLD (ISA)

Cheap Flights from Washington to Mount Isa (IAD-ISA)

Prices were available within the past 7 days and start at $1,346 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Flights from Washington (IAD) to Mount Isa (ISA)
Origin airport
Washington Dulles Intl.
Destination airport
Mount Isa
Distance
9911 mi

Washington to Mount Isa Flights

The cheapest times to fly from Washington to Mount Isa

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Mount Isa are during the month of . You can find some of the cheapest flights from Washington to Mount Isa with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Mount Isa

Sunday is one of the best days to book for cheap flights from Washington to Mount Isa: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Mount Isa

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Mount Isa in 2025. You can also book with separate airlines for your outbound and return journeys, from $1,346 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Mount Isa flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Mount Isa airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA) cost?
Lock in a cheap one-way flight from $1,346 or cheap return flight from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA)?
The cheapest month to fly from IAD to ISA is , when there's less demand. Off-peak season is typically when better flight deals are available between these airports.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from IAD to ISA. Then, sort your results by "Price (lowest to highest)" to pick up a good deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA)?
You'll need to hop on a flight with a layover if you're traveling from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from IAD to ISA?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA)?
Book a flight from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures after this hour have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA) last-minute?
Booking your plane ticket from IAD to ISA shortly before your journey is typically more expensive. But if you're flexible with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book an IAD to ISA flight and hotel package?
You can save money by securing an IAD to ISA flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your ideal flights and accommodations, you can add extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Mount Isa Airport (ISA)?
Typically, it's possible to cancel or reschedule your IAD to ISA flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.